OF INSECTS. 
135 
tion of the intestine/' says Burmeister, speaking of 
that part which corresponds to what we have called 
after the French physiologists, the small intestine, 
“ is to he determined from its divisional distance from 
the stomach, it must be considered as the true ilium, 
which is however contradicted by its function, which, 
like that of the caecum of the glires of the mammalia, 
subjects the food to a second digestion and extraction 
before it is rejected. We are convinced of this by 
the comparison of its state in the stomach, and in 
this portion of the canal, for we find it here much 
more pappy than there, but not so viscous as in the 
colon."* 
The Ccecum (PI. II. fig. 2 g.) is that portion of the 
canal, behind the small gut, where the unassimilated 
parts of the alimentary substances, now completely 
deprived of their nutricious particles, begin to acquire 
a hard consistency, previous to their expulsion by the 
rectum. It is generally a direct continuation of the 
small intestine, but it is divided from it by a valve, 
which completely shuts up the opening. In some 
cases, however, the intestine is united to its side, and 
it forms a large ovoid vessel, as in Dgtiscus Rceselii, 
and allied species. The external surface is frequently 
covered with papill®, and the internal, particularly 
near the mouth of the small gut, with glandular warts, 
which are supposed to secrete a fluid to assist in the 
expulsion of the fecal matter. This segment of the 
canal is usually short, but it varies too much to admit 
Manual of Entom. ; Shuckhard’s Trans. 139. 
